Subjective Responses to Changes in Spectral Power Distributions of LED Light

Yun, Geun Young; Kim, Hyoin; Kim, Jeong Tai

doi:10.1177/1420326x12469736

Cited by 2 publications

(3 citation statements)

References 30 publications

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“…Background luminance is an important criterion in lighting design and evaluation. However, according to the previous studies, 7,[10][11][12][13]20 only illuminance values were measured and background luminance values were not given in their subjective response tests evaluating brightness perception. Similar workplane illuminance levels and background luminance levels were assumed in the present research and the same luminaires in the same interior finished environment were used.…”

Section: Subjective Evaluations Outlinementioning

confidence: 99%

“…Recently, Yun et al. 19,20 reported that subjects tend to perceive more brightness under red colour emphasizing spectral power distribution, as compared to their perception under blue colour. In addition, the potential effects of spectral power distributions of LED lighting on subjective responses including the evaluation on likeness, comfort, preference, clarity, brightness, glare, skin colour, lighting colour, overall satisfaction and work performance were investigated.…”

Section: Introductionmentioning

confidence: 99%

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Brightness perception of white LED lights with different correlated colour temperatures

Kim

Jang

Choi

et al. 2014

Indoor and Built Environment

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Various luminous environments can be created by utilizing light emitting diode (LED) lights which can be easily controlled with diverse illuminance and correlated colour temperature (CCT) levels. Implementation of such luminous environments could affect occupants’ perceptions. This study aim to identify subjective brightness perception of young healthy female and male students being exposed to different CCT conditions of LED lights in lecture room environment. To measure brightness perception, three subjective evaluations were conducted. First, brightness perception in different CCTs was compared under single CCT LED lights. Second, a single CCT of LED light was compared to the same CCT under mixed CCTs. Third, different mixing methods for a particular CCT were applied to mixed CCTs of LED lights. The results of the first test showed that the subjects perceived the environmental space to be brighter when exposed to a higher CCT with the same illuminance level. The second experiment showed that LED lights with mixed CCTs are relatively superior to LED lights with a single CCT in terms of brightness perception under the same illuminance level. The third experiment illustrated that the subjects would feel their environment as brighter when exposed to higher CCT and/or with a larger proportion of high CCT. The selections and mixing among different CCTs for classroom design can be determined based on the results of this study where brightness perception is important.

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Section: Subjective Evaluations Outlinementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Brightness perception of white LED lights with different correlated colour temperatures

Kim

Jang

Choi

et al. 2014

Indoor and Built Environment

View full text Add to dashboard Cite

show abstract

“…Figure 1 shows the subject participating in the experiment. A detailed experimental procedure was given in a study by Yun et al [8].…”

Section: Methodsmentioning

confidence: 99%

Energy-Saving Potential of LED Lighting Systems

Yun

Jung

Kim

2012

Indoor and Built Environment

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Light emitting diode (LED) with its long lifetime of up 100,000 h has been receiving keen interest as there has been a rapid increase in luminous efficacy of LED recently. One interesting feature of LED is that its spectral power distributions can be easily controllable by regulating electric circuits to LED. Therefore, the same colour from LED can have quite different spectral power distribution due to metamerism. This is important as spectral power distribution is a key factor that can affect human circadian rhythm and subjective responses to changes with different spectral power distribution under the same illuminance level. The study aims to explore the energy saving potentials of LED lighting system by modulating spectral power distributions. The wavelength controllable LED system was developed in the previous study and was used in this study. Dynamic building simulations were carried out in order to quantify the total energy use including energy demands for lighting, cooling and heating indoors. Our study indicates that subjects would tend to feel brighter under red-colour emphasizing spectral power distribution, as compared to their perception under blue-colour. Also, simulation results indicate that total energy consumption can be reduced by 38% by changing spectral power distribution without sacrificing subjects’ visual comfort.

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Subjective Responses to Changes in Spectral Power Distributions of LED Light

Cited by 2 publications

References 30 publications

Brightness perception of white LED lights with different correlated colour temperatures

Brightness perception of white LED lights with different correlated colour temperatures

Energy-Saving Potential of LED Lighting Systems

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